don't use guidea as font as it appears to give troubles to windows/chrome
users, see also here: http://stackoverflow.com/questions/11487427/is-there-any-font-smoothing-in-google-chrome
change to the non-serif version of "Deja Vu"
just use "sans-serif" as the default font, thankfully recommended by hynek.
Fixed test_plugins_index to work on python 2.6

- Expected and obtained modules now use .rst to avoid being picked as doctests
- Fixed test_plugins_index.expected to use the real py.test version
Formatted plugins_index files to use a 80 char width

- Formatted code to follow pep-8 more closely;
- Got rid of header comments to better follow py.test coding style;
plugins_index.py and test run under py33

changed a message a bit since issue405 has actually been resolved
updated plugins_index for pytest 2.5.1 release
fix issue409 -- better interoperate with cx_freeze by not
trying to import from collections.abc which causes problems for py27/cx_freeze.